Introduction - If you have any usage issues, please Google them yourself
GTween is a small but extremely robust ActionScript 3 library for programmatic tweening, animation, and transitions, built by Grant Skinner of gskinner.com. It is currently comprised of 3 key classes:
GTween (3.5kb). A robust tweening engine, packed full of innovative features.
GTweenTimeline (1kb). A powerful virtual timeline that extends GTween to enable you to sequence tweens and actions.
GTweener (0.5kb). A static interface to GTween.
It also comes with a variety of plug-ins and easing classes.